San Francisco's City Attorney has sent a warning letter to the Kellogg Food Company about the big "Now Helps Support Your Child's Immunity" banner on its Rice Krispie's cereals. The City Attorney expresses concern that the "Immunity Claims may mislead parents into believing that serving this sugary cereal will actually boost their child's immunity," and asks Kellogg's to provide evidence substantiating the claims.

A copy of the letter is available here (pdf), and you can read more in The Atlantic.